Bag-formed container

Abstract

To provide a bag-formed container that, even if there is encountered a deviation in positioning between a cutting line and a bag body into overlapping of an end of the cutting line with an edge of a tearing strip, pulling up the tearing strip by a user turns a cut-assurance portion formed nearby the end of the cutting line into a new start point of stress concentration and allows for smoothly carrying out opening work of the bag-formed container.SOLUTION: A bag-formed container comprises a bag body that forms an accommodation space by folding back or superposing together a rectangular film and an elongate tearing strip that is arranged on a back side of the film, the tearing strip is formed with a grip portion by a cutting line the film is cut so as to have two ends outside both edges of the tearing strip in a width direction of the tearing strip, so that a user can tear and open the bag body by taking the grip portion and pulling up the tearing strip. In at least one of the ends of the cutting line, a cut-assurance portion the film is cut is formed outside in the width direction of the tearing strip.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a bag-like container that is opened using a tear strip, and that allows the tear strip to be reliably pulled up even if there is a deviation in the position of the notch molded around the grip formed at the end of the tear strip. [Background technology]

[0002] In recent years, pouch-shaped containers that can be opened by tearing the surface of the container using a tear strip have become widely used. In pouch-shaped containers with this structure, the composite film that makes up the pouch-shaped container minimizes the effects of outside air and light on the contents until the tear strip is used to tear the surface of the container, thereby reliably preventing deterioration of the contents, such as oxidation, during transportation and long-term storage.

[0003] In addition, a structure has been proposed in which zipper tape is placed alongside the tear strip, allowing a bag-like container to be reopened once opened, allowing the contents of the bag-like container to be dispensed in small amounts while maintaining its quality for a specified period of time even after opening and closing.

[0004] As an example of this bag-shaped package, the following prior art exists. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2018-188196 [Patent Document 2] Patent Publication No. 2023-157728

[0006] The bag-shaped container of Patent Document 1 has a structure in which a tear strip (tear guide strip) 21 is attached to the back surface of the surface 11A of the bag-shaped container, and a cutting line 30 is formed on the surface 11A of the film constituting the bag-shaped container so as to surround one end of the tear strip, thereby forming a grip portion (tab portion) 3 of the tear guide strip 21. The user then grips this grip portion 3 and pulls the tear strip 21 outward through the film of the bag-shaped container, thereby tearing the surface 11A and opening the container.

[0007] The bag-like container of Patent Document 2 also has a long member 120, which is formed by attaching a tear strip (tear strip) 122 to a base strip 121 and integrating the tear strip with the base strip 121, joined to the surface 111A of the bag-like container 100. As in Patent Document 2, a C-shaped notch is formed around one end of the tear strip 122, and the inside of the notch forms a gripping portion (tab) 130, and by pulling up this gripping portion 130, the surface 111A of the film of the bag-like container 100 is torn, thereby opening the container.

[0008] In addition, the bag-shaped containers in both documents have zipper tape (reference numbers 601 and 612 in Patent Document 1, and reference numbers 124A and 124B in Patent Document 2) laid in parallel with tear strips (tear guide strip 21 in Patent Document 1, tear strip 122 in Patent Document 2), so that once the bag-shaped container has been opened with the tear strip, it can be resealed with the zipper tape and opened again.

[0009] All tear strips have a cutting line (notch) formed at one end to form a gripping portion (grip portion 3 in Patent Document 1, tab 130 in Patent Document 2). However, if the relative position of the cutting blade and the bag body is misaligned during the process of forming the cutting line on the bag-shaped container, one end of the cutting blade may extend beyond the edge of the tear tape and dig into the inside of the tear tape (see Figure 3(a)).

[0010] Here, when the tear strip is pulled up, the bag body is torn by twisting between the material of the bag body fixed to the edge of the tear strip being pulled up and the material on the outside, creating a stress concentration point in this area and twisting off the material of the bag body (see P1 in Figure 3(b)).

[0011] However, as mentioned above, if one end of the cutting line goes inside the tear strip, the material of the bag body will not twist, and a stress concentration point will not be formed between the materials of the bag body, resulting in a product that is difficult to open (see P2 in Figure 3(b)).

[0012] In particular, this opening and closing failure can occur even with extremely minute positioning errors of just a few tenths of a millimeter at the end of the cutting line, making it difficult to eliminate defective opened products through visual inspection. In order to detect such defects, machine-based image recognition is required, which requires a large investment. Summary of the Invention [Problem to be solved by the invention]

[0013] The object of the present invention is to provide a structure that, in the manufacturing process of a bag-shaped container equipped with a tear strip, does not cause any problems in opening the bag-shaped container using the tear strip, even if the cutting line accidentally enters the side edge of the tear strip when a gripping portion is formed at the end of the tear strip using a cutting blade. [Means for solving the problem]

[0014] In order to achieve the above object, the bag-shaped container of the present invention comprises a bag body that forms a storage space by folding or overlapping a rectangular film, and a long tear strip that is placed on the back side of the film, and the tear strip has a gripping portion formed by a cutting line that cuts the film so that the tear strip has two ends outside both edges of the tear strip in the width direction of the tear strip, and the user holds the gripping portion and lifts the tear strip to cut and open the bag body, and the bag-shaped container is characterized in that a security cutting portion is formed by cutting the film near at least one of the ends of the cutting line, outside the width direction of the tear strip. [Effects of the Invention]

[0015] With the bag-shaped container of the present invention, even if the positioning of the cutting line and the bag body is misaligned during the process of forming a cutting line at the end of the tear strip to form a gripping portion, and the end of the cutting line catches on the edge of the tear strip, when the user pulls up the tear strip, the safety cutting portion formed near the end of the cutting line becomes the starting point of a new stress concentration point, allowing the bag-shaped container to be opened smoothly. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a front view of a bag-shaped container according to a first embodiment of the present invention. [Figure 2] Enlarged view of part A in Figure 1. [Figure 3] 10(a) and 10(b) are explanatory diagrams illustrating situations in which defects in opening occur in a conventional bag-shaped container. [Figure 4] 5A and 5B are explanatory views showing the function of the safety cut-off line in the bag-shaped container of the present embodiment. [Figure 5] 1(a), (b), and (c) are explanatory views showing other embodiments of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] (First embodiment) The structure of a first embodiment of a bag-shaped container of the present invention will be described with reference to Figures 1 and 2. Figure 2 is an enlarged view of region A in Figure 1.

[0018] 1, the structure of the bag-shaped container 1 of this embodiment is formed by the following process: The left and right ends of a rectangular film are folded back and joined together, and then joined by a method such as heat welding to form a back joint 11, and a cylindrical body is formed by superimposing the front film 1A and the back film 1B.

[0019] The lower end of the cylindrical body is then joined by heat welding or the like to form a lower end joint 13, forming a storage space between the front film 1A and the back film 1B, and after items to be stored such as food or medicine are placed into this storage space from the open upper end, the upper end is similarly joined by heat welding or the like to seal the storage space.

[0020] The film that makes up the bag-shaped container 1 has a gas barrier layer. This gas barrier layer is produced by coating the surface of a substrate such as PET, oriented nylon (ONy), oriented polypropylene (OPP), or unoriented polypropylene (CPP) with silica or alumina, which can be formed into a transparent, ultrathin film, by vapor deposition. This keeps the contents stored in the storage space protected from air and light until the contents are opened, enabling long-term storage.

[0021] Additionally, a transparent sealant layer made of low-density polyethylene (LDPE), linear polyethylene (LLDPE), or concentrated polyethylene (CPP) is formed on top of the gas barrier layer. During the manufacturing process for the bag-shaped container described above, these sealant layers are heat-sealed to each other and to tear tape 7 and zipper tape 8, which will be described later.

[0022] As shown in FIGS. 1 and 2, a tear tape 7 is fixed to the back side of the surface film 1A of the bag-shaped container 1 so that the surface film 1A can be torn with a tear strip 2a to open the bag-shaped container.

[0023] This tear tape 7 is an integrated unit consisting of a long tear strip 2a and a base strip 2b that fits the tear strip 2a into a groove (not shown) on the surface. This tear tape 7 is positioned and welded to the surface 1A prior to the process of the bag-like container 1 described above, and the top surfaces of the tear strip 2a and base strip 2b are independently fixed to the sealant layer on the surface of the storage space of the bag-like container 1.

[0024] In order to improve the separability between the tear strip 2a and the base strip 2b, one is made of a low-density polyethylene resin, and the other is made of a resin that is less compatible with this low-density polyethylene, such as a random polypropylene resin.

[0025] Near one end 2c of the tear strip 2a, a C-shaped tear line 3 is formed, penetrating the surface 1A of the bag-like container 1 from the front to the back. This tear line 3 starts at 3a near the upper edge of the tear strip 2a, descends in an ascending arc in a mountain shape, crosses the end 1c of the tear strip 2a, forms a symmetrical mountain shape at the top, and ends at 3b near the lower edge of the tear strip 1a.

[0026] The area surrounded by this cutting line 3 becomes the gripping portion 4 of the tear strip 2a, and the user can lift the gripping portion 4, pinch it, and pull the tear strip 2a up from the base strip 2b to cut the surface 1A of the bag-like container 1 and open the bag-like container 1.

[0027] Furthermore, a pair of security tear lines (security tear portions) 5 (5a, 5b) are formed near the ends 3a, 3b of the tear line 3. The security tear lines 5 are short, straight tear lines formed along the direction in which the gripping portion 4 is pulled up, and do not overlap the ends 3a, 3b of the tear line 3 in the width direction of the tear strip 2a. As a result, the distance L2 between the pair of security tear lines 5a, 5b is set to be greater than the distance L1 between the ends 3a, 3b of the tear line 3.

[0028] The security cutting line 5 is formed at the same time as the cutting line 3 using a punching die, and the punching die is made up of a combination of a Thomson blade, which is made by fixing a separate blade body and cuts the cutting line 3, and a Pinnacle blade (registered trademark) which can be processed into a fine shape by etching and cuts the security cutting lines 5a and 5b (the selection of the Thomson blade or the Pinnacle blade is made appropriately depending on durability, etc.). The effects of the security cutting portions 5a and 5b will be described later.

[0029] An airtight sheet 6 is attached to the back side of surface film 1A of bag-shaped container 1 at the position of grip part 4. This airtight sheet 6 has a square welded area 6a that crosses tear strip 2a and surrounds grip part 4, and area 6b that communicates with the outside air is isolated from the inside of bag-shaped container 1 by cutting line 3 and security cutting line 5, thereby maintaining airtightness of the storage space of bag-shaped container 1.

[0030] Additionally, zipper tape 8 is laid below and parallel to tear strip 2a (tear tape 7) on bag-shaped container 1. Zipper tape 8 is composed of protrusions 8a fixed to the back side of surface film 1A of the bag-shaped container, and grooves 8b fixed to a sealing sheet (not shown) that covers the opening portion of surface film 1A by tear strip 2b.

[0031] By repeatedly engaging and separating the ridges 8a and grooves 8b of the zipper tape 8, the bag-like container that has been opened by the tear strip can be resealed and re-opened.

[0032] The effects of this embodiment will be described with reference to Figures 3 and 4. Figure 3 shows a conventional bag-shaped container 1 which, unlike this embodiment, does not have a security cut line 5, while Figure 4 shows the bag-shaped container 1 of this embodiment which has a security cut line 5.

[0033] First, as shown in Figure 3(a), in a conventional bag-shaped container 1, if the relative position between the surface film 1A of the bag-shaped container 1 and the punch die for forming the cutting line 3 is misaligned during the process of forming the cutting line 3, for example, one end 3b of the cutting line 3 may be formed by biting inward from the lower edge of the tear strip 2a.

[0034] In this state, when the tear strip 2a is pulled up using the gripping portion 4, the stress concentration point P1 at the other end 3a of the cutting line 3 is on the film 1b outside the tear strip 2a (on the upper edge 2b of the base), so the surface film 1a welded to the upper surface of the tear strip 2a and the film 1b welded to the upper surface of the base strip 2b next to it are twisted, and the surface film 1A is torn along the edge of the tear strip 2a.

[0035] However, if the edge 3b is formed inside the tear strip 2a, the stress concentration point P2 will not cause a twist between the film 1a on the tear strip 2a and the film 1b on the base strip 2b, and therefore the surface film 1A of the bag-like container 1 will not be torn, and the tearing process will stop midway, resulting in a defective product.

[0036] In contrast, in the bag-shaped container 1 of this embodiment, as shown in Figure 4(a), even if a similar shift occurs during the process of forming the cutting line 3, the guaranteed cutting line 5b, which is located outside the end 3b of the cutting line 3, will be detached from the tear strip 2a and formed on the base strip 2b.

[0037] Therefore, when the tear strip 2a is pulled up by the gripping part 4 in this state, the force is concentrated at the stress concentration point P2 located inside the tear strip 2a, but this force is eventually transmitted to the end of the safety cut line 5b located near the stress concentration point P2, which becomes a new stress concentration point P3, causing a twist between the film 1a on the tear strip 2a and the film 1b on the base strip 2b.

[0038] Then, the twisting between them restarts the tearing state, and the tear strip 2a is pulled up to the end, completing the opening operation of the bag-like container 1.

[0039] The opposite safety cutting line 5a is not used because the end 3a of the cutting line 3 becomes a stress concentration point P1 on the outside of the tear strip 2a.

[0040] In this way, in the bag-shaped container 1 of this embodiment, the guaranteed cutting lines 5a, 5b are formed outside the ends 3a, 3b of the cutting line 3, so that even if the tear strip 2a is used to open the bag-shaped container, it is possible to guarantee that the tear strip 2a can be used to open the bag-shaped container, as long as the tear strip 2a is within half the difference between the distance L1 between the former and the distance L2 between the latter, even if the tear strip 2a is used during the process of forming the cutting line 3. (Other embodiments)

[0041] Another embodiment is shown in Figure 5. In another embodiment shown in Figure 5(a), a pair of security cutting lines 15 (15a, 15b) are formed in a V-shape that opens toward the grip portion 4 side.

[0042] With this structure, even if the positions of the cutting line 3 and the security cutting line 15 are significantly shifted, the starting point of the security cutting line 15, which becomes the point of stress concentration, is located outside the tear strip 2a, thereby improving the opening security effect.

[0043] 5(b) shows another embodiment in which a pair of safety tear lines 25 (25a, 25b) are arranged in the longitudinal direction of the tear strip 2a so as to overlap the ends 3a, 3b of the tear line 3. In this embodiment, the grip part 14 cut out by the tear line 3 is longer at the bottom than at the top, based on the longitudinal direction of the tear strip 2a, making it easier for the user to open it.

[0044] With this structure, even if one of the ends 3a, 3b of the cutting line 3 gets into the tear strip 2a, the tearing operation can be continued from a closer position, with one of the safety cuts 25a, 25b acting as a stress concentration point again.

[0045] In another embodiment shown in FIG. 5(c), in addition to the pair of security cutting lines 5 (5a, 5b), a pair of second security cutting lines 35 (35a, 35b) is formed on the outer side in the width direction of the tear strip 2a.

[0046] With this structure, even if the cutting position of the punch die on the bag-shaped container 1 shifts significantly and one of the security cutting lines 5a, 5b gets inside the tear strip 2a, one of the second security cutting lines 35a, 35b will function as the starting point for the re-stress concentration point, thereby further improving the opening security effect.

[0047] The first embodiment and other embodiments have been described above as specific bag-shaped containers of the present invention. However, for example, the security tear portion of the present invention may be a security tear point (point) rather than a security tear line (line segment). Furthermore, if the surface film is misaligned only in one direction, either vertically or horizontally, during the tear line formation process, the security tear lines do not need to be a pair, and may be formed singly on only one of the tear strips. Furthermore, the zipper tape 8 attached to the bag-shaped container 1 is optional, and the bag-shaped container 1 may be provided with only tear tape 7. [Explanation of symbols]

[0048] 1 Bag-shaped container 1A Surface film 1B Back film 1a. Surface film fixed to tear strip 1b Surface film fixed to base strip 2a tear strip 2b Base strip 3 Cutting line 3a, 3b Ends of cutting lines 4 Grip part 5, 5a, 5b Guaranteed cutting line (guaranteed cutting part) 6 Airtight Sheet 7 Tear Tape 8 Zipper tape (zipper) 14 Gripping part 15, 15a, 15b Guaranteed cutting line (guaranteed cutting part) 25, 25a, 25b Guaranteed cutting line (guaranteed cutting part) 35, 35a, 35b 2nd security cutting line (2nd security cutting part) L1 Distance between the ends of a pair of cutting lines L2 Distance between a pair of safety cut lines P1, P2, P3 stress concentration points

Claims

1. A bag-like container having a bag body formed by folding or overlapping a rectangular film to form a storage space, and a long tear strip disposed on the back side of the film, wherein the tear strip has a grip portion formed by cutting the film along a cutting line so that the tear strip has two ends on the outer sides of both edges of the tear strip in the width direction of the tear strip, and a user holds the grip portion and lifts the tear strip to tear the bag body and open it, A bag-shaped container characterized in that a security cut portion is formed by cutting the film at at least one of the ends of the cutting line, outside in the width direction of the tear strip.

2. The bag-shaped container according to claim 1, A bag-shaped container characterized in that a pair of the security cut portions are formed across the tear strip, and the distance between the pair of security cut portions is greater than the distance between the ends of the tear line.

3. The bag-shaped container according to claim 1 or 2, A bag-shaped container, wherein at least the security cut portion of the cutting line and the security cut portion is formed by an etching blade.

4. The bag-shaped container according to claim 1 or 2, A bag-shaped container characterized in that it further has a zipper that is fixed to the sealing sheet and the bag body, is arranged parallel to the tearable elongated material and between the front and rear films, and seals and can be easily opened an opening to the storage space formed by the tearable elongated material.

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